I don't know what part of the country you are in, but I don't want any part of my interior home to be that hot. I would invest in some proper ventilation and get that closer to ambient. I don't know that I would just assume a cheap PoE is the way to go. The switch I listed is one developed for industrial applications, the possibility of a hardware failure is going to be low. A cheap PoE switch is going to be around $40 and if you have to replace it once, you are already in the hole about what the industrial switch would have cost the first time. Some people don't consider their personal time messing with things to be of any value, but I do and it is worth more than $20 to make up the difference.